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Old 31st March 2012, 08:57 PM   #3231
robbbby is offline robbbby  Canada
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Join Date: Feb 2012
Thanks, i'll remove some of the anodizing on the bottom plate of the case so it has a good solid connection though I doubt that will help my issue since I tested everything completely out of the case on a piece of wood.
 
Old 1st April 2012, 10:52 AM   #3232
kbergsson is online now kbergsson  Iceland
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Quote:
Originally Posted by Erlend Sæterdal View Post
And you use XLR ?
No I used unbalanced as in figure 4 i chapter 12.3.2 Hardbonded RCAs and no mains earth.
Kjartan
 
Old 1st April 2012, 03:49 PM   #3233
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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Originally Posted by kbergsson View Post
No I used unbalanced as in figure 4 i chapter 12.3.2 Hardbonded RCAs and no mains earth.
Kjartan
What on earth is this ? It is not possible to post reply without Quote ! ???

Well now I mounted the XLR and still no sound. Could it be because its impossible without the SMPS supply ?
I use 2x65 V for the output and 2x22 vdc for the input section. Ground from the opamp supply is coupled to the ground on the output supply !
 
Old 1st April 2012, 04:34 PM   #3234
Julf is offline Julf  Europe
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Quote:
Originally Posted by Erlend Sæterdal View Post
What on earth is this ? It is not possible to post reply without Quote ! ???
Yes it is. Using the "Post reply" button in the lower left corner.

Quote:
Well now I mounted the XLR and still no sound. Could it be because its impossible without the SMPS supply ?
I use 2x65 V for the output and 2x22 vdc for the input section. Ground from the opamp supply is coupled to the ground on the output supply !
So, let's just check your connections. Your 2x65 V is connected to pins 1 and 2 (+), 7 and 8 (-) and 3, 4, 9 and 10 (ground), and the 2x22 V is connected to pin 6 (+), pin 12 (-) and 3, 4, 9 and 10 (ground) on J7? And pin 2 on the XLR is connected to pin 1 on J9 (+in), pin 3 on the XLR is connected to pin 2 on J9 (-in) and pin 1 on the XLR to chassis/ground? And finally - pin 3 on J9 (nAMPON) is connected to ground?

Have you measured that your 65V and 22V supplies are within limits even under load?
 
Old 1st April 2012, 04:34 PM   #3235
robbbby is offline robbbby  Canada
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I just redid my chassis, made sure all ground connections were good on the smps leg and xlr connectors and made sure there is very low resistance between all the pieces of the chassis that are screwed together and i'm still getting > 0.5VDC at the outputs with and without the xlr from dac connected and with and without the wires hooked up to the speakers!
 
Old 1st April 2012, 04:41 PM   #3236
waltzingbear is offline waltzingbear  United States
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Quote:
Originally Posted by robbbby View Post
I just redid my chassis, made sure all ground connections were good on the smps leg and xlr connectors and made sure there is very low resistance between all the pieces of the chassis that are screwed together and i'm still getting > 0.5VDC at the outputs with and without the xlr from dac connected and with and without the wires hooked up to the speakers!
what did you end up doing with the nAMPon wire?

what is the offset with the nAMPon open?

Alan
 
Old 1st April 2012, 05:17 PM   #3237
robbbby is offline robbbby  Canada
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Originally Posted by waltzingbear View Post
what did you end up doing with the nAMPon wire?

what is the offset with the nAMPon open?

Alan
nampon wire is permanently connected to pin1/case ground. By offset are you referring to voltage difference on the output with the wire grounded and ungrounded? If so I believe it was a 0.2V difference. I'm not home though so I cannot verify, I will double check later though.
 
Old 1st April 2012, 06:24 PM   #3238
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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Quote:
Originally Posted by Julf View Post
Yes it is. Using the "Post reply" button in the lower left corner.

I did !



So, let's just check your connections. Your 2x65 V is connected to pins 1 and 2 (+), 7 and 8 (-) and 3, 4, 9 and 10 (ground), and the 2x22 V is connected to pin 6 (+), pin 12 (-) and 3, 4, 9 and 10 (ground) on J7? And pin 2 on the XLR is connected to pin 1 on J9 (+in), pin 3 on the XLR is connected to pin 2 on J9 (-in) and pin 1 on the XLR to chassis/ground? And finally - pin 3 on J9 (nAMPON) is connected to ground?

Have you measured that your 65V and 22V supplies are within limits even under load?

Yes Yes Yes Yes to everything.
But but but my gnd on the 2 x 65 is not connected to the chassis.
 
Old 1st April 2012, 06:26 PM   #3239
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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Quote:
Originally Posted by robbbby View Post
nampon wire is permanently connected to pin1/case ground. By offset are you referring to voltage difference on the output with the wire grounded and ungrounded? If so I believe it was a 0.2V difference. I'm not home though so I cannot verify, I will double check later though.
The offset on my output is 0,2 V to.
 
Old 1st April 2012, 06:32 PM   #3240
Julf is offline Julf  Europe
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Quote:
Originally Posted by Erlend Sæterdal View Post
But but but my gnd on the 2 x 65 is not connected to the chassis.
Shouldn't matter as long as it is connected to the ground pins on the nc400.
 

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